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why it is sticking?
This occurs in the Constant current Power source chareteristics as the volttage, which is the distance between the tip of the electrode and the work to be welded is controlled manually by the skill level of the welder. When the electrode tip got heated up and the distance is too short the moltendrop gets in contact with the work piece and cooled rapidly due to lower heat input and get stuck as the welding circuit closes. This is common weld start problem associated with the welders skill level, to be able to start and move the welding arc.
Welding rod stick provides close contact with the base metal and constitutes to form a closed electric circuit, which produces arc at high voltage which heats the base metal to palstic state and joins the base metal
The Amperage which is set on the welding machine of the welding is not lower then the temperature can not achieve the melting point properly.
Electrodes only stick during welding due to inexperience of the welder to maintain proper arc length and incorrect heat input emanating from poor welding parameter settings
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